$bits
$bits :
<p>A simple, fast array of bits, represented compactly by an array of ints internally.</p>
isRange( $start, $end, $value) : true
Efficient method to check if a range of bits is set, or not set.
$start | ||
$end | ||
$value |
if end is less than or equal to start
iff all bits are set or not set in range, according to value argument